@article{Poggiolini:2006aP,
  author = "Poggiolini, Laura  and  Stefani, Gianna",
  title = "{On second order sufficient optimality conditions for a bang-singular arc}",
  doi = "10.22323/1.018.0017",
  journal = "PoS",
  year = 2006,
  volume = "CSTNA2005",
  pages = "017"
}